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Ottawa knee rule

A knee x-ray is only required for knee injury patients with any of these findings:

  • age 55 or over
  • isolated tenderness of the patella (no bone tenderness of the knee other than the patella)
  • tenderness at the head of the fibula
  • inability to flex to 90 degrees
  • inability to weight bear both immediately and in the casualty department (4 steps - unable to transfer weight twice onto each lower limb regardless of limping)

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